Figure 1. Map of the Alboran Sea and surrounding regions. The region containing Miocene subduction-related (calc-alkaline and ultrapotassic) volcanic rocks (encircled with a dashed line) correlates well with the outline (solid line) of the central portion of the synthetic slab SYN1 at 247 km depth from the P-wave seismic tomographic results of Blanco and Spakman (1993). Data come from the following sources: Ait-Brahim and Chotin (1990), Araña and Vegas (1974), Bellon (1976), Bellon and Brousse (1977), Bellon et al. (1983), Blanco and Spakman (1993), Bordet et al., (1982), Bourdier (1986), Comas et al. (1992), M. Comas (pers. comm., 1995), Di Battistini et al. (1987), Dupuy et al., (1986), Fernandez Soler (1992), Hernandez and Bellon (1985), Hernandez et al., (1987), Munksgaard (1984), Torres-Roldán et al. (1986), Venturelli et al. (1984), and Zeck (1996).

Figure 1. Map of the Alboran Sea and surrounding regions. The region containing Miocene subduction-related (calc-alkaline and ultrapotassic) volcanic rocks (encircled with a dashed line) correlates well with the outline (solid line) of the central portion of the synthetic slab SYN1 at 247 km depth from the P-wave seismic tomographic results of Blanco and Spakman (1993). Data come from the following sources: Ait-Brahim and Chotin (1990), Araña and Vegas (1974), Bellon (1976), Bellon and Brousse (1977), Bellon et al. (1983), Blanco and Spakman (1993), Bordet et al., (1982), Bourdier (1986), Comas et al. (1992), M. Comas (pers. comm., 1995), Di Battistini et al. (1987), Dupuy et al., (1986), Fernandez Soler (1992), Hernandez and Bellon (1985), Hernandez et al., (1987), Munksgaard (1984), Torres-Roldán et al. (1986), Venturelli et al. (1984), and Zeck (1996).